Cannot work after bun build

[seepine]

I use simplewebauthn/server in bun

import 'reflect-metadata'
import {
  generateRegistrationOptions,
  verifyRegistrationResponse,
  generateAuthenticationOptions,
  verifyAuthenticationResponse
} from '@simplewebauthn/server'

And build as singlefile

import { build } from 'bun'

const res = await build({
  entrypoints: ['src/index.ts'],
  target: 'bun',
  minify: true,
  sourcemap: 'linked',
  outdir: 'dist',
  compile: { outfile: 'app' },
  define: {
    'process.env.NODE_ENV': JSON.stringify('production'),
  },
})

But got error

elysia-template-1  | 1 | if (typeof Reflect === "undefined" || !Reflect.getMetadata) {
elysia-template-1  | 2 |     throw new Error("tsyringe requires a reflect polyfill. Please add 'import \"reflect-metadata\"' to the top of your entry point.");
elysia-template-1  |                   ^
elysia-template-1  | error: tsyringe requires a reflect polyfill. Please add 'import "reflect-metadata"' to the top of your entry point.
elysia-template-1  |       at <anonymous> (../node_modules/tsyringe/dist/esm5/index.js:2:15)
elysia-template-1  |       at <anonymous> (/$bunfs/root/index.js:2:520)
elysia-template-1  |       at <anonymous> (../node_modules/@peculiar/x509/build/x509.es.js:36:1)
elysia-template-1  |       at <anonymous> (/$bunfs/root/index.js:2:520)
elysia-template-1  |       at <anonymous> (../node_modules/@simplewebauthn/server/esm/helpers/isCertRevoked.js:1:1)
elysia-template-1  |       at <anonymous> (/$bunfs/root/index.js:2:520)
elysia-template-1  |       at <anonymous> (../node_modules/@simplewebauthn/server/esm/helpers/index.js:10:1)
elysia-template-1  |       at <anonymous> (/$bunfs/root/index.js:2:520)
elysia-template-1  |       at <anonymous> (../node_modules/@simplewebauthn/server/esm/helpers/iso/isoCrypto/verifyOKP.js:2:1)
elysia-template-1  |       at <anonymous> (/$bunfs/root/index.js:2:520)
elysia-template-1  | 
elysia-template-1  | Bun v1.3.9 (Linux arm64)

[MasterKale]

Interesting. If you run bun list --all do you see the reflect-metadata package as a dependency of @peculiar/x509, which is a dependency of @simplewebauthn/server@13.2.0 and up?

[seepine]

$ bun list --all                
/Users/seepine/workspace/issues/simplewebauthn-demo node_modules
├── @hexagon/base64@1.1.28
├── @levischuck/tiny-cbor@0.2.11
├── @peculiar/asn1-android@2.6.0
├── @peculiar/asn1-cms@2.6.1
├── @peculiar/asn1-csr@2.6.1
├── @peculiar/asn1-ecc@2.6.1
├── @peculiar/asn1-pfx@2.6.1
├── @peculiar/asn1-pkcs8@2.6.1
├── @peculiar/asn1-pkcs9@2.6.1
├── @peculiar/asn1-rsa@2.6.1
├── @peculiar/asn1-schema@2.6.0
├── @peculiar/asn1-x509@2.6.1
├── @peculiar/asn1-x509-attr@2.6.1
├── @peculiar/x509@1.14.3
├── @simplewebauthn/server@13.2.2
├── @types/bun@1.3.9
├── @types/node@25.2.3
├── asn1js@3.0.7
├── bun-types@1.3.9
├── pvtsutils@1.3.6
├── pvutils@1.1.5
├── reflect-metadata@0.2.2
├── tslib@2.8.1
├── tsyringe@4.10.0
│   └── tslib@1.14.1
├── typescript@5.9.3
└── undici-types@7.16.0

[MasterKale]

Huh, tsyringe and reflect-metadata seem to be present...I have to admit I'm not a Bun expert so I'm not sure what's going on here. Is @simplewebauthn/server otherwise working as expected in your Bun project?

[canstand]

I had to add hooks to nitro config, and I've completely forgotten where I found this solution.

(Nuxt v4 config)

nitro: {
   hooks: {
      'rollup:before': function (ctx) {
        ctx.options.moduleSideEffects = ctx.options.moduleSideEffects || []
        ctx.options.moduleSideEffects.push('reflect-metadata') // better-auth/passkey: tsyringe requires a reflect polyfill
      },
    },
}

[MasterKale]

Thanks for the tip @canstand. Would you say this is a Bun problem? A web framework problem? Something I can solve upstream in this project to fix this for you and others in the future?

[canstand]

I compared the histories of my two projects from the same period (October 2025), and I'm certain the problem occurred during the upgrade from v13.1.2 to v13.2.2.

Other differences should be irrelevant:

vite v7.1.9 -> vite v7.1.11
nuxt v4.1.3 -> nuxt v4.1.3